It was rated as RRR in Mr. Saran Singh book "The Encyclopaedia of THE COINS OF MALAYSIA- SINGAPORE AND BRUNEI 1400-1967".

On the obverse of the gold Kupang coin, a Kijang/Barking Deer/Nandi Bull is standing surrounded by a full circle of beads/dots. It was without horn, only visible are two hard pointed (dots) growth on the heads with saliva (Ectoplasm) flows down from mouth. Fat body with rounded hump and tail pointed down.

On the reverse, in Arabic inscription " Al Adil". It shows a concave curvature in the center of the coin. According to a senior collector of the Malay States Sultanate coinage, he told me this SS58 Gold Kupang exhibited a concave curvature on the reverse is a very rare item.

The crescent moon on top of the Kijang/Barking Deer/Nandi Bull on the obverse, shows fish tails.